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  • Open Daily: 10am - 10pm
    Alley-side Pickup: 10am - 7pm

    3038 Hennepin Ave Minneapolis, MN
    612-822-4611

Open Daily: 10am - 10pm | Alley-side Pickup: 10am - 7pm
3038 Hennepin Ave Minneapolis, MN
612-822-4611
An Essay on the Air-Pump and Atmospheric Railway; Containing Formulae and Rules for Calculating the Various Quantities Contained in Mr. Robert Stephe

An Essay on the Air-Pump and Atmospheric Railway; Containing Formulae and Rules for Calculating the Various Quantities Contained in Mr. Robert Stephe

Turnbull, William

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ISBN10: 0217112692
ISBN13: 9780217112697
Publisher: General Books
Pages: 54
Weight: 0.13
Height: 0.05 Width: 7.44 Depth: 9.69
Language: English
This historic book may have numerous typos, missing text or index. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. 1847. Not illustrated. Excerpt: ... its full content at every stroke. It is well known, however, that this degree of perfection is not attainable in practice; for besides the unavoidable imperfections in working the air-pump, a very considerable leakage of air from the atmosphere takes place at the continuous valve, or flap, which closes the aperture on the top of the pipe, and this leakage is received into the vacuum tube, not at the same degree of density as the atmosphere in its natural state, but dilated according to the degree of rarefaction in the vacuum tube in front of the piston, and for this reason, the effect upon the velocity will vary with different states of the exhaustion. It therefore appears, that the amount of lost power in consequence of the leakage, and the corresponding diminution of the practical velocity arising from it, constitute the chief, if not the only drawback, on this very ingenious and novel mode of propulsion; and, for this reason, it becomes a matter of the greatest importance that the actual effects of this leakage should be properly understood and duly appreciated. Now Mr. Robert Stephenson, in his report to the Directors of the Chester and Holyhead Railway Company, on the atmospheric system of transit, remarks, that the most obvious method of determining the amount of leakage is, to observe the rate at which the mercury in the barometer gauge descends from a higher degree of vacuum to a lower; for it is manifest, that the difference between the quantities of air in the tube at the times of observation, will be the amount of leakage that has taken place during the interval. In order, therefore, to arrive at the knowledge of this very important point, Messrs. Bergin and Stephenson have each performed a set of experiments according to the method above proposed, an...

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